Hand brake



Sept. l2, P12933. w F, RlCHARDs 1,926,175

HAND BRAKE Filed Nov. 18, 1927 2 Sheets-Sheet l w. F. RICHARDS HAND BRAKE Segr. 12, 1933.

Filed Nov. 18, 1927 2 SheetS-Shee'l'I 2 Patented Sept. 12, 1933 UNITED STATES PATENT orificeA HAND BRAKE Willard F. Richards, Depew, N. Y., assignor to The Symington Company, New York, N. Y., a corporation of Maryland Application November 18, 1927 Serial No. ,234,238

5 Claims. (Cl. T4- 112) This invention relates to hand brakes and,

more particularly, to a geared brake with a high gear ratio whereby a large amount of force may be readily applied to the brake rigging of a car.

The principal object ofv my invention, generally considered, is to provide a geared hand brake in which all the pinions and gears are enclosed in a single housing and in which a double reduction in the gearing together with a decrease in the size of the gears is effected by providing a plurality of double intermediate pinions which are engaged by the driving pinion simultaneously with their operation on the main gear which acts directly on the winding drum for the brake chain.

An object of my invention is to provide-a geared hand brake in which the brake stafl:` or

shaft has 'a driving pinion thereon,

which pinion, instead of directly engaging the main gear, acts on intermediate pinions which, in turn, operate the main gear whereby a double drive for said main gear is effected permitting the use of a relatively light gear.

Another object of my invention i a geared hand brake in which a reduction is provided between the driving pin' s to provid double gear ion and main gear whereby all gears and pinions may be made small permitting the employment of a compact gear assembly.

A further object of my invention is the provision of a geared hand brake mechanism in which all the gears and pinions are enclosed in a unitary housing, whichhousing is -provided with angular braces extending from below and serving to support the lower end of the drum pivot and preferably formed integral with the gear housing. y VA still further object of my inve ntion is the parent as the description proceeds.

Referring to the drawings illustrating my invention, the scope whereof is dened by the appended claims:

y Figure 1 is a fragmentary end elevation ofa railway car to which an embodiment 0f my in- Vention has been applied.

Figure 2 is a fragmentary plan, partly in section, of the arrangement shown in Figure 1.

Figure 3 is a plan of the brake gearinghousing showing the pinions and gear enclosed therein, a portion of said housing being broken away to more clearly show the gearing.

Figure 4 is a vertical sectional View on the line 4 4 of Figure 3 looking in the direction of the arrows, the brake chain winding drum being shown in side elevation.

Figure 5 is a Vertical sectional View on the line 5-5 of Figure 3 looking in the direction of the arrows.

Figure 6 is a plan of the brake chain winding drum detached from the associated mechanism.

Referring to the drawings in detail, like parts being designated by like reference characters, there isillustrated the brake gearing assembly lconnected to the end of a car 2 as by means of rivets or other connecting means 3 applied throughiiange portions of the housing 5 of the gear mechanism. A guiding sheave 6 is pivotally mounted underneath the car on a bracket'l by means of a pivot pin 8 and serves for guiding the brake chain 9 diagonally toward the side of the car and, from there, to the brake rigging, as will be understood by those skilled in the art. Y I y The brake mechanism, in accordance with the present embodiment of my invention, involves a brake shaft or staff 10, the upper end oi' which may have any suitable manual operating means (not shown) such as a wheel or lever and the lower end of said shaft is preferably formed with an angular portion l1 fitting in a hub 12, the lower end of said hub being formed as a pivot 13 secured in a step .bearingV 14 in the brake gear housing 5. By forming the angular portion 11 on the lower part of the brake staff 10, the hub portion v12, which is provided with a toothed portion 15 forming a driving pinion for the mechanism, is properly driven by said shaft. Retainer means such as a cotter i6 is desirably provided for holding the staff 10 and drum12 in assembled position. The intermediate portion of said drum 12 is formed circular in cross section'and removable bearing members if? are provided which are held in a correspondingly shaped pccketed portion 18 in the housing 5 by securing means such as a cotter 19. y

The main gear 2O is pivotally mounted in the housing 5 by means of a pivot pin 21, `the upper end of which is secured in a corresponding aperture 22 in the. wall 23 of the housing which is preferablyseparate from the main gear and isl interlocked therewith, however, when assembled, in any desired manner as by means of the extension 29 from the lower face of said gear being received in a corresponding pocket or notch 30 in the upper face of the drum 28. Said drum is preferably provided with an arm 31 to the end of which the brake chain `9 is secured as by means of a pin 32 inserted from above and prevented from loss or removal after' assembly with the .gear 20 by having the head.

33 thereof held between the lower face ofv the gear and the upper face oi the drum as most clearly shown in Figure fl.` The drumv 28 is pref.-v

. erably formed so that the chain 9y is rapidly wound upA at rst, the rate of winding .of said chain gradually decreasing with an increase in the available force in a manner well known to those skilled in the art.

Instead of providing for the .direct engage.- ment between the driving pinion 15 and the main' gear 20, a plurality or pair of intermediate .pinions 34 are provided. Said pinions, in the present embodiment, are of the integral or unitary double variety with an upper toothed portion 35 of relatively llarge diameter engaged by the driving pinion 15 and a lower toothed portion 36V engaging the main gear. Said .pinions are pivotally mounted on pins 37 rextending through bosses 38 and 39 in the walls LiL-and 4l of the housing 5 and secured in position by any desired means such as the cotters 42v extend: ing through the lower ends o1" the pins 3.7.,and the lower bosses 39, thereby not only preventing undesired removal of said pins but preventing rotation thereof with respect to the housing.

Erom the foregoing disclosure of my invention, it will be apparent that I have devised a geared hand brake in which the main gearA may be made with a narrow tooth face and thereby formed relatively light inweight. In order to have a suiiicient area of engagement between the gear and pinion teeth, two intermediate pinions are provided which simultaneously eng gage the gear, thus making double the number of teeth engaged than ir" a singleintermediate pinion were employed.

By using double intermediate pinions with the upper toothed portions formed relatively large and engaged by the driving pinion and the lower toothed portions relatively small .anden-v gaging the driven gear, a double reduction in gear ratio is obtained, thereby making it possibleto use relatively small gears and pinionsA with a more compact mechanical arrangement.

The gearing is housed within the` main bracket housing and thus protected. The brake mastorv L in two pieces having projections for the purpose or resting on the ledge oi the housing to sustain the weight of the brake mast and its parts,

providingl the collar above the bearingcomes in contact with the bearing, which it 'is liable to do owing tothe variations in .thecastings The three angular braces cast integral with and depending from the housing securely hold the pivot pin of the chain winding drum and main gear at its lower end and thereby firmly sustain the pull of the brake chain. The angular arrangement oi these braces, as shown by the drawings, is occasioned by the particular application of the brake to the car involving adiag-I onal pull on the brake chain.

The chain winding drum is a separate part from the main driving gear and operated thereby and interlocked therewith, the construction shown being for the purpose of ease in removing or assembling the parts and to make a strong driving connection between the gear and the chain drum. By virtue of having the drum and gear in separate pieces, the chain retaining pin in the extended arm of the drum does not require a cotter or othermeans to hold it in place. Thepivot pin of the chain drum is removable from the bottom4 and held from rotating in the bracket housing to` prevent wear ofthe pin holes, thuscaus'ing all the wearto occur on the pivot pin and in the bearing hole of the chain drum and gear. These parts can be easily replaced whereas the main housing bracket may, in most cases, be riveted to the car structure through the connectingapertures Yillustrated not only in the vertical wall of the housing adjacent the end of the car but also in the horizontal wall thereof which directly underlies said ear. This horizontal wall, if desired, may be lightenedby the provision of the relatively large circular apertures illustrated. Ihe chain drum arm is given the particular configuration disclosed and is so connected to the drum that it eniciently guides they chain therearound, it being vapparent that thisV type4 of brake mechanism provides for quickly picking up Vthe slack inthe chain at the start and eventually provides for applying a large amountof force thereto. f

I-Iaving nowV described my invention I claim:

1. A, brake mechanism comprising a driving pinion, a chain windingdrum, gearing therebetween providing a multiple reduction in driving ratio, and a housing for said pinion, drumand gearing, said pinion comprising a hub kportion between a` supporting flange and the toothed portion of the pinion, and removable bearing members embracingA said hubV portionand receivedin a pocket in the housing. f

2. A brake mechanism comprising adriving pinion, `a chain Winding drum, a main ,gearoonnected toY said drum, aplurality of intermediate pinions engaged by the driving` pinion Aand engaging, the mainv gear for furnishing a multiple drivetherebetween, and ahousing for .said pinions, drum and gear, said housingbeingpocketedand removable bearing members .held in said pocket and,in turn, serving to mount the driv-v ing pinion in place.;V 3. A brake mechanismcomprising a maingear, a housing enclosingsaid gear, means pivotally mounting said vmain gear in they housing, a chainl winding drum mounted on saidv pivotal means, means extending between said gear and drum f for operatively connecting the same for simultaneous 'rotation in both directions, and means for connecting an associated brake chain to said drum comprising a pin extending through aperturedportions of the drum with the head thereof normally disposed between the gear and drum, whereby undesired removal of the pin is prevented v l A 4. In a brake mechanism, in combination, a

housing with a pocket, a driving pinion, formed by a toothed portion and having a supporting flange rotatably mounted therein and comprising va hub portion disposed between said angev and the toothed portion thereof, and removable bearing members embracing said hub portion and received in the pocket of the housing.

5. A brake mechanism comprising a pivotally mounted main gear, a chain winding drum pivotally mounted therebeneath, means extending between said drum and gear for operatively connecting the same for simultaneous rotation,. 

